Upon contraction, the smallest motor unit, that is, the one associated with the fewest muscle fibers, is the normally the first activated. As the contraction progresses, larger motor units are brought into play.Efficient muscle contraction depends on the motor units within a muscle working effectively together.pon contraction, the smallest motor unit, that is, the one associated with the fewest muscle fibers, is the normally the first activated. As the contraction progresses, larger motor units are brought into play.
Trojan programs are most dangerous because they can create a back door. into your computer that gives malicious hackers direct access to your. system. Once installed, Trojans can hijack your PC and upload usernames, passwords, credit card numbers, social security numbers, and bank account.
Unknown programs requesting access. Computer security programs and firewalls help restrict access for security purposes. If the computer prompts for access to programs you do not know, rogue programs may be installed or it may have been hacked. Backdoors and trojans are by far the most common programs installed on a computer after it has been hacked. 2  These programs can allow the hacker to gain access to a large amount of information stored on your computer.